Architectural project, blueprints, blueprint rolls and divider compass, calipers, folding ruler on plans Engineering tools view from the top. Copy space. Construction background. Blue toned 建筑项目，蓝图，蓝图卷和分隔指南针，卡尺，折叠标尺在平面工程工具视图从顶部。复制空间。施工背景.